Cardiac support device delivery tool with release mechanism

ABSTRACT

An apparatus for placing a cardiac support device (CSD) on a heart. The apparatus includes a body, a deployment mechanism on the body for supporting the CSD in an open position for placement on the heart, and a release mechanism coupled to the deployment mechanism for releasably mounting the CSD to the deployment mechanism. The release mechanism includes a release element for releasably engaging the CSD, and a release actuator coupled to the release element for actuating the release element to release the CSD.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of application Ser. No. 12/638,059filed on Dec. 15, 2009, which is a continuation of application Ser. No.11/487,953 filed on Jul. 17, 2006, now U.S. Pat. No. 7,651,462, which ishereby incorporated by reference in its entirety for all purposes.

FIELD OF THE INVENTION

The present invention pertains to a method and apparatus for treatingcongestive heart disease and related valvular dysfunction. Moreparticularly, the present invention is directed to an apparatus andmethod for delivery of a cardiac support device.

BACKGROUND OF THE INVENTION

Various cardiac support devices for treating congestive heart diseaseare known. One exemplary type of cardiac support device includes acardiac jacket for reducing tension in the heart wall by constraining orresisting expansion of the heart. Devices and methods for deliveringcardiac support devices using minimally invasive surgical procedures arealso known. Such cardiac support devices and/or cardiac support devicedelivery devices are described, for example, in U.S. Pat. Nos.5,702,343; 6,155,972; 6,193,648; 6,293,906; 6,482,146; 6,682,476;6,902,524; 6,425,856; 6,908,426; 6,572,533; and 6,951,534, all of whichare assigned to Acorn Cardiovascular, Inc. and are incorporated hereinby reference.

Other embodiments of cardiac support devices and/or cardiac supportdevice delivery devices are disclosed in U.S. Pat. Nos. 6,702,732;6,723,041; U.S. patent application publication no. US 2006/0009831 A1published Jan. 12, 2006; U.S. patent application publication no. US2005/0288715 published Dec. 29, 2005; U.S. patent applicationpublication no. US 2005/0256368 A1 published Nov. 17, 2005; U.S. patentapplication publication no. US 2005/0171589 published Aug. 4, 2005; U.S.patent application publication no. US 2005/0090707 A1 published Apr. 28,2005; and U.S. patent application publication no. US 2005/0059855 A1published Mar. 17, 2005, all of which are incorporated herein byreference.

There remains, however, a continuing need for improved delivery devicesfor cardiac support devices. In particular, there is a need for adelivery device for efficiently and effectively releasing the cardiacjacket over the heart.

SUMMARY OF THE INVENTION

In one embodiment, the present invention is an apparatus for placing acardiac support device (CSD) on a heart. The apparatus includes a body,a deployment mechanism on the body for supporting the CSD in an openposition for placement on the heart, and a release mechanism coupled tothe deployment mechanism for releasably mounting the CSD to thedeployment mechanism. The release mechanism includes a release elementfor releasably engaging the CSD, and a release actuator coupled to therelease element for actuating the release element to release the CSD.

In another embodiment, the present invention is an apparatus for placinga cardiac support device (CSD) on a heart. The apparatus includes anelongate body, a deployment mechanism slidably coupled to the body forsupporting the CSD, and a release means on the body for releasablycoupling the CSD to the deployment mechanism.

In yet another embodiment, the present invention is a method fordeploying a cardiac support device (CSD) about a heart of a patient. Themethod includes releasably coupling the CSD to a deployment mechanism ofa delivery apparatus, positioning the CSD in a desired position aboutthe heart using the delivery apparatus, and actuating a releasemechanism to de-couple the CSD and the deployment mechanism. The releasemechanism includes a release element coupled to the deployment mechanismand a release actuator coupled to the release element.

While multiple embodiments are disclosed, still other embodiments of thepresent invention will become apparent to those skilled in the art fromthe following detailed description, which shows and describesillustrative embodiments of the invention. Accordingly, the drawings anddetailed description are to be regarded as illustrative in nature andnot restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a CSD mounted on an exemplary delivery device that can beused in relation to embodiments of the present invention.

FIG. 2A shows a front view of the delivery device of FIG. 1 in aretracted state.

FIG. 2B shows a front view of the delivery device of FIG. 1 in anextended state.

FIG. 2C shows a perspective view of a portion of a control mechanism andrelease mechanism of FIG. 1.

FIG. 2D shows a perspective view of the distal ends of the supportmember and release clement shown in FIG. 1.

FIG. 3A shows a front view of the release element in relation to thesupport member of FIG. 1.

FIG. 3B shows the release element and support member of FIG. 3A inrelation to a portion of the CSD shown in exploded detail.

FIG. 4A shows a front view of a delivery device according to anotherembodiment of the invention in a retracted state.

FIG. 4B shows a front view of the delivery device of FIG. 4A in anextended state.

FIG. 4C shows a side view of a portion of the control mechanism andrelease mechanism of FIG. 4A.

FIG. 5A shows a front view of a delivery device according to anotherembodiment of the invention in a retracted state.

FIG. 5B shows a front view of the delivery device of FIG. 5A in anextended state.

FIG. 5C shows a perspective view of a portion of the release mechanismof FIGS. 5A.

FIG. 5D shows a cross sectional view of a portion of the controlmechanism and release mechanism of FIG. 5A.

FIG. 6A shows a front view of a delivery device according to anotherembodiment of the invention in a retracted state.

FIG. 6B shows a front view of the delivery device of FIG. 6A in anextended state.

FIG. 6C shows a perspective view of a portion of the release mechanismof FIGS. 6A and 6B.

FIG. 7A shows a front view of a delivery device according to anotherembodiment of the invention in an extended state.

FIG. 7B shows a cross-sectional view of the delivery device of FIG. 7Ataken along line 6-6.

FIG. 8A shows a release element and support member according to anotherembodiment of the present invention coupled to a CSD.

FIG. 8B shows the release element and support member of FIG. 8A releasedfrom the CSD.

FIG. 9A shows a release element and support member according to anotherembodiment of the present invention coupled to a CSD.

FIG. 9B shows the release element and support member of FIG. 9A releasedfrom the CSD.

FIG. 10A shows a release element and support member according to anotherembodiment of the present invention coupled to a CSD.

FIG. 10 B shows the release element and support member of FIG. 10Areleased from the CSD.

FIG. 11A shows a portion of a release mechanism according to anotherembodiment of the invention.

FIG. 11B shows the release mechanism of FIG. 11A coupled to a portion ofa CSD.

FIG. 11C shows the release mechanism of FIG. 11B de-coupled from theCSD.

FIG. 12A shows a CSD having a release structure according to oneembodiment of the invention.

FIG. 12 B shows a release mechanism according to one embodiment of thepresent invention in relation to the CSD of FIG. 12A.

FIG. 12C shows a side-sectional view of the CSD of FIG. 12A coupled tothe release mechanism.

FIG. 13A shows a CSD having a release structure according to yet anotherembodiment of the invention.

FIG. 13B shows the release structure of FIG. 13A and a release mechanismaccording to one embodiment of the invention.

FIG. 13C shows the actuation of the release mechanism within the releasestructure shown in FIG. 13A.

FIG. 13D shows the release mechanism de-coupled from the releasestructure of FIG. 13A.

FIG. 14A shows a release structure and release mechanism according toanother embodiment of the present invention.

FIG. 14B shows a front view of the release mechanism coupled to therelease structure of FIG. 14A.

FIG. 14C shows a front view of the release mechanism de-coupled from therelease structure shown in FIG. 14B.

FIG. 15A shows a portion of a release mechanism releasably coupled to aCSD according to another embodiment of the invention.

FIG. 15B shows a side view of the release mechanism and CSD of FIG. 15A.

FIG. 15C shows a side view of the release mechanism of FIG. 15B releasedfrom the CSD.

FIG. 16A shows a release structure and release mechanism according toanother embodiment of the present invention.

FIG. 16B shows a front view of the release mechanism coupled to therelease structure of FIG. 16A.

FIG. 16C shows a front view of the release mechanism de-coupled from therelease structure shown in FIG. 16B.

FIG. 17 shows a detailed and partially sectional view of a supportmember and release element in accordance with another embodiment of theinvention, in an engaged state.

FIG. 18 shows a detailed view of a portion of the support member andrelease element shown in FIG. 17, in a released state.

While the invention is amenable to various modifications and alternativeforms, specific embodiments have been shown by way of example in thedrawings and are described in detail below. The intention, however, isnot to limit the invention to the particular embodiments described. Onthe contrary, the invention is intended to cover all modifications,equivalents, and alternatives falling within the scope of the inventionas defined by the appended claims.

Detailed Description Of The Preferred Embodiments

FIG. 1 illustrates a delivery device 100 according to one embodiment ofthe present invention supporting a cardiac support device (CSD) 104 fordeployment over a patient's heart. The CSD 104 may be any type ofcardiac support device, including, without limitation, any of thedevices disclosed in any of the patents and patent publicationsreferenced and incorporated herein in the Background of the Invention.In the illustrated embodiment, the CSD 104 includes an open base end 108and an apex portion 112 having an open apex end 116. A hem 117 is formedabout the open base end 108 of the CSD 104.

As shown in FIG. 1, the delivery device 100 includes a body 120, adeployment mechanism 124, an actuator or a control mechanism 128 on thebody 120 operatively coupled to the deployment mechanism 124, and arelease mechanism 132 (see FIG. 2C) on the body 120 for releasablycoupling the CSD 104 to the deployment mechanism 124.

The deployment mechanism 124 is operable to move between a firstretracted or closed state, as shown in FIG. 2A, and a second extended oropen state, as shown in FIG. 1. FIG. 2B shows the deployment mechanism124 moved to an extended but not opened state. The deployment mechanism124 is further adapted to releasably support the CSD 104 and toaccurately position the CSD 104 at a desired implantation position onthe patient's heart. The deployment mechanism 124 includes at least oneelongate support member 136. In the illustrated embodiment, thedeployment mechanism 124 includes eight support members 136. Theinvention is not so limited, however, and the deployment mechanism 124may include a greater or few number of support members 136 in varyingconfigurations.

The control mechanism 128 drives the deployment mechanism 124 betweenthe retracted and extended states for positioning the CSD 104 on theheart. In the illustrated embodiment, the control mechanism 128 isslidable along a portion of the length of the body 104 to move thesupport members 136 from the retracted state to the extended state. Inthe illustrated embodiment, the support members 136 are curved so thatthe support members 136 form a cup shape to receive the CSD 104 when inthe extended state. In other embodiments (not shown), the controlmechanism 128 also includes means for spreading apart or otherwiseshaping the support members 136 when in the extended state.

The release mechanism 132 releasably couples the CSD 104 to thedeployment mechanism 124. Thus, once the delivery device 100 has beenmanipulated to maneuver the CSD 104 into position over or about all or aportion of the heart, the release mechanism 132 is operated to releasethe CSD 104 from the delivery device 100 onto the heart. The releasemechanism 132 includes a release element 140 (see FIG. 2A) forreleasably engaging the CSD 104 and an actuator mechanism 144operatively coupled to the release element 140 to control release of theCSD 104 from the release element 140.

In the illustrated embodiment, the release element 140 is an elongatemember positioned adjacent to each of the support members 136. A distalend 148 of the release element 140 is movable from an engaged state inwhich the release element 140 permits the CSD 104 to be mounted to thedeployment mechanism 124 and a released state in which the releaseelement 140 releases the CSD 104 from the deployment mechanism 124. Anactuator mechanism 144 is operable to move the release element 140between the engaged and released states. In the illustrated embodiment,the release elements 140 slide through a channel 156 in the supportmembers 136. The support members 136 are formed with a plurality ofslots 158 to provide incremental advancement of the release elements 140relative to the support members 136.

In the embodiment illustrated in FIGS. 1 and 2A-2D, the controlmechanism 128 and the actuator mechanism 144 are integrated into acylinder 160 positioned about the body 120. The cylinder 160 slides overa first or main travel region T while moving the all of the supportmembers 136 from the retracted state to the extended state. A secondcontrol mechanism 138 including a first user interface 164 is providedfor moving individual support members 136 from the retracted state tothe extended state. The first user interfaces 164 are individuallyslidable over a second or supplementary travel region t to move thesupport members 136. The release elements 140 remain in the engagedstate while the support members 136 are moved from the retracted stateto the extended state.

The actuator mechanism 144 is actuated by sliding a second userinterface 168 coupled to the support elements 140 over a third orindividual travel region I to move the release elements 140 betweenengaged and released states. In the illustrated embodiment, the actuatormechanism 144 is operable to actuate the release elements 140individually. In other embodiments, however, two or more, or all, of therelease elements 140 may be actuated as a group.

As illustrated generally in FIG. 3A, the CSD 104 includes a releasestructure 170 releasably engaged by one or both of the deploymentmechanism 124 and the release element 140. The release structure 170 isadapted for coupling to the deployment mechanism 124 for facilitatingrelease of the CSD 104 from the deployment mechanism 124. In addition,some embodiments of the CSD 104 includes a lubricious element 174.Lubricious element 174 can also be releasably coupled to the CSD 104 bythe release mechanism 132. Specifically, the release mechanism 132 isoperable to de-couple at least a portion of the lubricious element 174from the CSD 104.

FIG. 3B illustrates the release element 140 in more detail. The releaseelement 140 is in the form of a hook. A release structure 170 in theform of a loop of cord or suture is coupled to the hem 117 of the CSD104. In the engaged state, the release structure 170 is coupled to therelease element 140 through a hole 157 in the lubricious element 174.

The CSD 104 is placed over a patient's heart with the device 100 asfollows. The CSD 104 is mounted to the deployment mechanism 124 with therelease elements 140 in the engaged state. The deployment mechanism 124is put into the retracted state as shown in FIG. 2A. The delivery devicebody 120 is manipulated to position the CSD 104 near the heart. The userslides the cylinder 160 distally over the body 120, advancing thesupport members 136 from the retracted state to the extended state whilethe release elements 140 remain in the engaged state. The user mayactuate the first user interfaces 164 to move the support members 136between the retracted and extended states individually to more preciselyposition the CSD 104 about the heart.

Once the CSD 104 is maneuvered into the desired position, the actuatormechanisms 144 are actuated by sliding the second user interfaces 168 tomove the release elements 140 from the engaged state to the releasedstate to release the CSD 104 from the delivery device 100. In theengaged state, the release element 140 is retracted within the channel156 such that the release structure 170 coupled to the release element140. Upon movement of the release element 140 to the released state,shown in dashed lines, the release structure 170 is released from thesupport member 136.

FIGS. 4A-4C, 5A-5D, 6A-6C and 7A-7B illustrate various additionalembodiments of the control mechanism 128 and actuator mechanism 144.FIGS. 8A-8B, 9A-9B, 10A-10B, 11A-11C, 12A-12C, 13A-13D and 14A-14Cillustrate various additional embodiments of the release element 140 andrelease stricture 170. The various embodiments of the control mechanism128 and actuator mechanism 140 described with respect to FIGS. 1, 2A-2D,3A-3B, 4A-4C, 5A-5D, 6A-6C and 7A-7B may be used in an combination withthe various embodiments of the release element 140 and release structure170 described with respect to FIGS. a, 2A-2D, 3A-3B, 8A-8B, 9A-9B,10A-10B, 11A-11C, 12A-12C, 13A-13D and 14A-14C.

FIGS. 4A-4C illustrate a delivery device 200 according to anotherembodiment of the invention showing an alternate release mechanism. Asshown in FIG. 2A, the delivery device 200 includes a body 220, adeployment mechanism 224, a control mechanism 228 on the body 220operatively coupled to the deployment mechanism 224, and a releasemechanism 232 on the body 220 for releasably coupling a CSD (not shown)to the deployment mechanism 224.

Similar to previously described embodiments, advancing a cylinder 260actuates the control mechanism 228, moving the deployment mechanism 224from a retracted state as shown in FIG. 4A to an extended state as shownin FIG. 4B. In the illustrated embodiment, the control mechanism 228 isfurther provided with a locking feature 274 for locking individualadvancement of the support members 236. The locking feature 274 includesprotrusions 278 and keyways 282 formed in the cylinder 260. Rotation ofthe cylinder 260, as indicated by arrow 284, captures the protrusions278 in the keyways 282, preventing individual advancement of the supportmembers 236.

The release mechanism 232 includes a release element 240 and an actuatormechanism 244. The actuator mechanism 244 includes a tilting lever arm286 coupled to a mechanical linkage 290. Tilting the lever arm 286forward, as indicated by arrow 292, pulls the linkage 290 proximally tomove the release elements 240 from an engaged state to a released state.The lever arm 286 is also part of the control mechanism 228 andfunctions as a user interface for advancing the support members 236individually.

FIGS. 5A-5D illustrate a delivery device 300 according to anotherembodiment of the invention showing an alternate release mechanism. Asshown in FIG. 5A, the delivery device 300 includes a body 320, adeployment mechanism 324, a control mechanism 328 on the body 320operatively coupled to the deployment mechanism 324, and a releasemechanism 332 on the body 320 for releasably coupling a CSD (not shown)to the deployment mechanism 324.

Similar to previously described embodiments, advancing a cylinder 360actuates the control mechanism 328, moving the deployment mechanism 324from a retracted state as shown in FIG. 5A to an extended (but notopened) state as shown in FIG. 5B. The control mechanism 324 furtherincludes user interface buttons 364 for individually advancing thesupport members 336 and release elements 340.

The release mechanism 332 includes a release element 340 and an actuatormechanism 344. The actuator mechanism 344 includes a rotating actuatorcylinder 391 that is coupled to all of the release elements 340. Theactuator mechanism 344 is operable to move all of the release elements340 from an engaged state to a release state in unison upon rotation ofthe actuator cylinder 391. The release elements 340 each have anengagement pin 392 that is synchronized with axial teeth 393 in theactuator cylinder 391. Rotational movement of the actuator cylinder 391captures the engagement pins 392 at various positions of individualadjustment of the support members 336. A keyway 394 in the cylinder 360controls rotation and forward movement of the actuator cylinder 391.

FIGS. 6A-6C illustrate another embodiment of a delivery device 400showing an alternative release mechanism. As shown in FIG. 6A, thedelivery device 400 includes a body 420, a deployment mechanism 424, acontrol mechanism 428 on the body 420 operatively coupled to thedeployment mechanism 424, and a release mechanism 432 on the body 420for releasably coupling a CSD (not shown) to the deployment mechanism424.

The release mechanism 432 includes a release element 440 and an actuatormechanism 444. Similar to previously described embodiments, advancing acylinder 460 actuates the control mechanism 424, moving the deploymentmechanism 424 from a retracted state as shown in FIG. 6A to an extendedstate as shown in FIG. 6B.

FIGS. 7A and 7B illustrate another embodiment of a delivery device 500showing an alternative release mechanism. As shown in FIG. 7A, thedelivery device 500 includes a body 520, a deployment mechanism 524, acontrol mechanism 528 on the body 520 operatively coupled to thedeployment mechanism 524, and a release mechanism 532 on the body 520for releasably coupling a CSD (not shown) to the deployment mechanism524. A suction cup 525 for releasably engaging a patient's heart isconnected to a vacuum source (not shown) though tube 527. Actuatormechanism 544 is operated in a manner similar to that of theabove-described embodiments to move the deployment mechanism 524 from aretracted position (not shown) to the extended and open position shownin FIGS. 7A and 7B. The support members 536 can be formed resilientmembers, and can be guided at least in part from their retractedpositions to the extended and open positions shown in FIGS. 7A and 7B bythe suction cup 525.

FIGS. 8A and 8B illustrate a support member 736, release element 740 andrelease structure 770 according to another embodiment of the invention.The release element 740 includes an opening 741. The release structure770 is in the form of a loop of cord or suture that is threaded througha portion of the CSD 104, with a first end 771 coupled to the deliverydevice 100 and a second end 772 that is free. When the release element740 is in the engaged state, as shown in FIG. 8A, the free end 772 ofthe release structure 770 is inserted through the hole 741 and therelease element 740 is retracted within the support member 736. The freeend 772 of the release structure 770 is thus captured between therelease element 740 and the support member 736, coupling the CSD 104 tothe support member 736. When the release element 740 is moved to thereleased state, shown in FIG. 8B, the release element 740 is advanceddistally relative to the support member 736, releasing the releasestructure 770. The release structure 770 is easily pulled through thehole 741 and the CSD 104 as the support member 736 is withdrawn.

FIGS. 9A and 9B illustrate a release element 840 and release structure870 according to another embodiment of the present invention. Therelease element 840 is in the form of a hook. The release structure 870is in the form of a loop of cord or suture having ends 871, 872 coupledto the CSD 104. The release structure 870 is captured by the hook of therelease element 840 and coupled to the support member 836 when therelease element 840 is in the engaged state, as shown in FIG. 9A. Whenthe release element 840 is moved to the released state, as shown in FIG.9B, the release structure 870 is released to de-couple the supportmember 836 and the CSD 104.

FIGS. 10A and 10B illustrate a release element 940 and release structure970 according to another embodiment of the present invention. Therelease element 940 is in the form of a pair of pincers 943, while therelease structure 970 is in the form of a loop of cord or suture havinga portion 773 coupled to the CSD 104. When the release element 932 is inthe engaged state, the release element 932 is retracted within thesupport member 936, causing the pincers 943 to be pinched together, thuscapturing the release structure 970, as shown in FIG. 10A. When therelease element 940 is moved to the released state, as shown in FIG.10B, the release structure 970 is advanced distally relative to thesupport member 936 and the pincers 943 spread apart to release therelease structure 970.

FIGS. 11A-11C illustrate a support member 1036, release element 1040 andrelease structure 1070 configuration according to another embodiment ofthe present invention. The release element 1040 is in the form of a flatrod received within a channel 1056 formed by the support member 1036. Adistal end of the support member 1036 includes an opening 1037. Therelease structure 1070 is in the form of a flexible band formed aroundat least a portion of the CSD 104. In the engaged state, the releasestructure 1070 is received in the opening 1037 and held in place by therelease element 1040 which is positioned at the opening 1037 (see FIG.11B). Upon movement of the release element 1040 from the engaged state,shown in FIG. 11B, to the release state, shown in FIG. 11C, the releaseelement 1040 is moved proximally within the channel 1057 to release therelease structure 1070 from the support member 1036.

FIGS. 12A-12C illustrate a support member 1136, release element 1140 andrelease structure 1170 according to another embodiment of the invention.The release structure 1170 is in the form of protrusions on the hem 117of the CSD 104 and each has an opening 1171 therethrough (see FIG. 12A).As shown in FIG. 12C, the support member 1136 has a distal recess 1137sized and shaped to receive the release structure 1170. The releaseelement 1140 is in the form of a slender rod sized to be received in theopening 1171. In the engaged state, shown in FIG. 12B, the releasestructures 1170 are positioned within the recesses 1137 and the releaseelements 1140 are inserted into the openings 1171 to hold the releasestructures 1170 in place. Upon movement of the release element 1140 fromthe engaged state, to the release state, shown in dashed lines in FIG.12C, the release element 1140 is withdrawn proximally out of the opening1171 to release the release structure 1170 from the recesses 1137.

FIGS. 13A-D illustrate a release element 1240, support member 1236 andrelease structure 1270 according to another embodiment of the invention.The release structure 1270 is in the form of a lock housing positionedon the hem 117 of the CSD 104. A hook 1272 is formed within the releasestructure 1270. The release structure 1270 further has a passageway 1271for receiving the release element 1240. In the engaged state, shown inFIG. 13B (release structure shown opened for clarity), the releaseelement 1240 is captured on the hook 1272. Upon movement of the releaseelement 1240 from the engaged state, shown in solid lines in FIG. 13C,to a release state, shown in dashed lines, the release element 1240disengages from the hook 1272, allowing the release element 1240 to bewithdrawn proximally through the passageway 1271 (see FIG. 13D).

FIGS. 14A-14C illustrate a release element 1340, support member 1336 andrelease structure 1370 according to another embodiment of the invention.The support member 1336 includes a U-shaped yoke 1338 defining anopening 1339. The release element 1340 is movable from an engaged state,in which the release element 1340 is proximal to the opening 1339 (seeFIG. 14B), to a release state, in which the release element 1340 ispositioned within the opening 1339 (see FIG. 14C). The release structure1370 is in the form of a projection sized and shaped to be snuglyreceived within the yoke 1338. Movement of the release element 1340 fromthe engaged state, shown in FIG. 14B, to the release state, shown inFIG. 14C, ejects the release structure 1370 from the yoke 1338.

FIGS. 15A-15C illustrate a portion of a release element 1440, supportmember 1436 and release structure 1470 according to another embodimentof the invention. The release structure 1470 is in the form of a lengthof cord or suture that is threaded through the CSD 104. The supportmember 1436 includes a pair of distal openings 1437 divided by a supportbridge 1438. The release element 1440 includes a cutting surface 1441.In the engaged state, shown in FIGS. 15A and 15B, the release element1440 is positioned proximally to the openings 1437. The releasestructure 1470 is threaded through the openings 1437 and tied over thebridge 1438 to couple the CSD 104 to the support member 1436. Uponmovement of the release element 1440 to the release state, shown in FIG.15C, the release element 1440 is moved distally over the releasestructure 1470 to cut the release structure 1470, thus releasing the CSD104 from the support member 1436.

FIGS. 16A-16C illustrate a support member 1336′ and release structure1370′ according to another embodiment of the invention. The supportmember 1336′ and release structure 1370′ can be substantially the sameor similar to support member 1336 and release structure 1370 describedabove in connection with FIGS. 14A-14C, and similar features areidentified by similar reference numbers. Unlike the embodiment of theinvention shown in FIGS. 14A-14C, the embodiment shown in FIGS. 16A-16Cdoes not include a release element 1340. Instead and as described ingreater detail below, support member 1336′ is passively disengaged fromthe release structure 1370′. The support member 1336′ includes a C-orU-shaped yoke 1338′ defining an opening 1339′. The release structure1370′ is in the form of a projection sized and shaped to be snuglyreceived within the yoke 1338′. Yoke 1338′ is formed of resilientmaterial that enables the yoke to sufficiently deform and “snap” ontothe release structure 1370′ (e.g., to diametrically expand and thenreturn to its original shape). The characteristics of the yoke 1338′ incooperation with the release structure 1370′ provides sufficientstrength to enable the yoke to remain attached to the release structurewhile CSD 104 is positioned on the patient's heart. Followingpositioning of the CSD 104, movement of the support member 1336′ in adirection opposite the opening in the yoke 1338′ causes the yoke todeform and disengage from the release structure 1370′. The supportmember 1336′ is thereby passively released from the CSD 104 since it wasthe motion of the support member itself, rather than another structure,that causes the release action.

FIGS. 17 and 18 illustrate a support member 1536 and release element1540 according to another embodiment of the invention. The supportmember 1536 is a tubular structure having an opening 1556 on its distalend. The release element 1540 is an elongate member movable within thesupport member 1536 between retracted and extended positions. A fingeron the distal end 1548 of the release element 1540 has a tang 1551 andan inner element 1553 that cooperate to provide a functional engagementportion. The distal end 1548 is formed with the tang 1551 and innerelement 1553 separated and spaced from one another when the releaseelement 1540 is in its released state shown in FIG. 18 with the distalend 1548 extending from the opening 1556 of the support member 1536. Thetang 1551 is formed of flexible and resilient material, enabling thetang to be deformed from its free or native state into the hook shape ofthe capture position shown in FIG. 17. When release element 1540 is inthe engaged state shown in FIG. 17, the tang 1551 is retained in thecapture position adjacent to inner element 1553.

The tang 1551 of release element 1540 can engage a release structuresuch a suture loop (not shown) on a CSD (also not shown) when therelease element is in the engaged state. When moved to the releasedstate shown in FIG. 18, the tang 1551 will return to its native state torelease the release structure. Locating the tang 1551 and inner element1553 at the opening 1556 on the distal end of the support member 1536can enhance the accuracy by which the CSD can be positioning on thepatient's heart.

Various modifications and additions can be made to the exemplaryembodiments discussed without departing from the scope of the presentinvention. For example, while the embodiments described above refer toparticular features, the scope of this invention also includesembodiments having different combinations of features and embodimentsthat do not include all of the described features. Accordingly, thescope of the present invention is intended to embrace all suchalternatives, modifications, and variations as fall within the scope ofthe claims, together with all equivalents thereof.

What is claimed is:
 1. An apparatus for placing on a heart a passivecardiac therapy device circumferentially extending around the heart, theapparatus comprising: a body; a deployment mechanism on the bodyincluding a plurality of elongate support members for supporting thecardiac therapy device in an open position for placement on the heart;and a release mechanism coupled to the deployment mechanism forreleasably mounting the cardiac support device to the deploymentmechanism, the release mechanism comprising a plurality of releaseelements each respectively attached to a distal end of each elongatesupport member of the plurality of elongate support members; and aplurality of control mechanisms on the body, wherein each controlmechanism individually moves one of the plurality of elongate supportmembers such that each support member together with its associatedrelease element can be moved independently of one another.
 2. Theapparatus of claim 1, wherein the body further comprises an internaltube having a proximal end in fluid communication with a vacuum sourceand a distal end with a suction cup for engaging with an apex of theheart.
 3. The apparatus of claim 2, wherein the plurality of elongatemembers are not inherently outwardly biased, and wherein the suction cupdeflects the plurality of elongate members outward as the plurality ofelongate members are moved distally relative to the body.